about laser

1. Presented by,
C.PRIYANKA KARANCY,
M.TECH,CCE

2.  Light Amplification by Stimulated Emission of
Radiation.
 A laser is a device that emits light through a
process of light amplification based on
the stimulated emission of electromagnetic
radiation.

3.  Laser light has three characteristics that
are different from ordinary light.
1. Directional property
2. Monochromatic property.
3. Coherent property.

4.  it is in the form of one wavelength,

5.  Laser light is emitted as a relatively
narrow beam in a specific direction.

6.  The light from a laser is said to
be coherent, which means the wavelengths
of the laser light are in phase in space and
time.

8.  The light moves through the medium
between the two mirrors that reflect the
light back and forth between them.
 One of the mirrors, however, only partially
reflects the light, allowing some to escape.
 The escaping light makes up the laser beam.

9.  Slope efficiency is the important property of
laser.
 The slope efficiency is the slope of this line.
 Slope efficiency can similarly be defined in
terms of output and input energies instead of
powers.
 This makes it applicable to pulsed lasers.

10.  Less expensive.
 More compact.
 Welding of complicated joint geometry.
 Low heat application, therefore minor
changes in microstructure
 Low thermal distortion.

11.  Have shorter coherent length.
 Laser equipment is expensive.

12.  Laser printers,
 Laser fax machines
 Supermarket bar code readers all use diode
lasers
 Eye surgery.
 Military application.

13.  PI characteristic of laser diode.
 Plotting the current in x-axis.
 Power in the Y-axis.

14. Thank you

15.  priyanka3karancy@gmail.com